diff --git a/Maths/ArmstrongNumber.js b/Maths/ArmstrongNumber.js
index a3ab78299f..8f861d8c15 100644
--- a/Maths/ArmstrongNumber.js
+++ b/Maths/ArmstrongNumber.js
@@ -9,16 +9,13 @@
*/
const armstrongNumber = (num) => {
- if (num < 0 || typeof num !== 'number') return false
-
- let newSum = 0
-
- const numArr = num.toString().split('')
- numArr.forEach((num) => {
- newSum += parseInt(num) ** numArr.length
- })
-
- return newSum === num
+ if (typeof num !== 'number' || num < 0) return false
+ const numStr = num.toString()
+ const sum = [...numStr].reduce(
+ (acc, digit) => acc + parseInt(digit) ** numStr.length,
+ 0
+ )
+ return sum === num
}
export { armstrongNumber }
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